title: 4-Meth-oxy-anilinium 2-carb-oxy-4,5-di-chloro-benzoate.
abstract: In the title salt C7H10NO(+)·C8H3Cl2O4 (-) the benzene rings of the cation and anion are essentially parallel [inter-ring dihedral angle 4.8 (2)°]. In the anion the carb-oxy-lic acid and carboxyl-ate groups make dihedral angles of 19.0 (2) and 79.5 (2)°, respectively, with the benzene ring. Aminium N-H⋯O, carb-oxy-lic acid O-H⋯O and weak aromatic C-H⋯O hydrogen-bonding associations with carboxyl O-atom acceptors together with cation-anion π-π ring inter-actions [minimum ring centroid separation = 3.734 (3) Å] give rise to a sheet structure lying parallel to (001).
authors.affiliation: Science and Engineering Faculty, Queensland University of Technology, GPO Box 2434, Brisbane, Queensland 4001, Australia.
authors.forename: Graham
authors.initials: G
authors.lastname: Smith
authors.forename: Urs D
authors.initials: UD
authors.lastname: Wermuth